单选题
She was on her ______ throughout the job interview because she didn't want to say anything stupid.
A、
defence
B、
care
C、
caution
D、
guard
【正确答案】
D
【答案解析】
[解析] defence防御；防卫。care关怀；照料。caution小心，谨慎。on one's guard小心；谨慎；以防。
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